[Slimdx]顶点和索引缓冲，绘制了2个分离的三角形
定义网格顶点和索引缓冲，绘制了2个分离的三角形。
1 using System; 2 using System.Drawing; 3 using RGeos.SlimScene.Core; 4 using SlimDX; 5 using SlimDX.Direct3D9; 6 using CustomVertex; 7 using RGeos.AppScene.Renderable; 8
9 namespace RGeos.SlimScene.Renderable 10 { 11 /// <summary>
12 /// 定义网格顶点和索引缓冲 13 /// </summary>
14 public class BoxMesh : RenderableObject 15 { 16 private CustomVertex.PositionColored[] vertices;//定义网格顶点
17 private short[] indices;//定义网格中三角形索引
18 private int modelVertCount = 0; 19 private int modelFaceCount = 0; 20 private VertexBuffer vertBuffer; 21 private IndexBuffer indBuffer; 22
23 public BoxMesh(string name) 24 : base(name) 25 { 26 this.isSelectable = true; 27 } 28 private void ComputeVertexs() 29 { 30 vertices = new CustomVertex.PositionColored[6]; 31
32 Vector3 pt = new Vector3(); 33 pt.X = 0; 34 pt.Y = 0; 35 pt.Z = 0; 36 vertices[0].Position = pt; 37 vertices[0].Color = Color.Red.ToArgb(); 38
39 Vector3 pt1 = new Vector3(); 40 pt1.X = 0; 41 pt1.Y = 10; 42 pt1.Z = 0; 43 vertices[1].Position = pt1; 44 vertices[1].Color = Color.Red.ToArgb(); 45
46 Vector3 pt2 = new Vector3(); 47 pt2.X = 0; 48 pt2.Y = 10; 49 pt2.Z = 10; 50 vertices[2].Position = pt2; 51 vertices[2].Color = Color.Red.ToArgb(); 52
53 Vector3 pt3 = new Vector3(); 54 pt3.X = 0; 55 pt3.Y = 20; 56 pt3.Z = 20; 57 vertices[3].Position = pt3; 58 vertices[3].Color = Color.Blue.ToArgb(); 59
60 Vector3 pt4 = new Vector3(); 61 pt4.X = 0; 62 pt4.Y = 20; 63 pt4.Z = 0; 64 vertices[4].Position = pt4; 65 vertices[4].Color = Color.Blue.ToArgb(); 66
67 Vector3 pt5 = new Vector3(); 68 pt5.X = 20; 69 pt5.Y = 0; 70 pt5.Z = 0; 71 vertices[5].Position = pt5; 72 vertices[5].Color = Color.Blue.ToArgb(); 73 } 74
75 /// <summary>
76 /// 计算索引 77 /// </summary>
78 private void ComputeIndices() 79 { 80 indices = new short[6]; 81
82 indices[0] = 0; 83 indices[1] = 1; 84 indices[2] = 2; 85 indices[3] = 3; 86 indices[4] = 4; 87 indices[5] = 5; 88
89 } 90
91 #region Renderable
92 /// <summary>
93 /// 初始化对象 94 /// </summary>
95 /// <param name="drawArgs">渲染参数</param>
96 public override void Initialize(DrawArgs drawArgs) 97 { 98 LoadTexturesAndMaterials(drawArgs);//导入贴图和材质
99 ComputeVertexs();//计算顶点
100 ComputeIndices();//计算索引
101
102 vertBuffer = BufferCreator.CreateVertexBuffer(drawArgs.Device, vertices); 103 indBuffer = BufferCreator.CreateIndexBuffer(drawArgs.Device, indices); 104 modelVertCount = vertices.Length; 105 modelFaceCount = indices.Length / 3; 106 this.isInitialized = true; 107 } 108
109
110 /// <summary>
111 /// 渲染对象 112 /// </summary>
113 /// <param name="drawArgs">渲染参数</param>
114 public override void Render(DrawArgs drawArgs) 115 { 116 if (!this.IsOn || !this.isInitialized) return; 117 //获取当前世界变换
118 Matrix world = drawArgs.Device.GetTransform(TransformState.World); 119 //获取当前顶点格式
120 VertexFormat format = drawArgs.Device.VertexFormat; 121 //获取当前的Z缓冲方式
122 int zEnable = drawArgs.Device.GetRenderState(RenderState.ZEnable); 123 //获取纹理状态
124 int colorOper = drawArgs.Device.GetTextureStageState(0, TextureStage.ColorOperation); 125
126 try
127 { 128 drawArgs.Device.SetTextureStageState(0, TextureStage.ColorOperation, TextureOperation.Modulate); 129 drawArgs.Device.SetTextureStageState(0, TextureStage.ColorArg1, TextureArgument.Texture); 130 drawArgs.Device.SetTextureStageState(0, TextureStage.ColorArg2, TextureArgument.Diffuse); 131 drawArgs.Device.SetTextureStageState(0, TextureStage.AlphaOperation, TextureOperation.Disable); 132
133 //设置顶点格式
134 drawArgs.Device.VertexFormat = CustomVertex.PositionColored.Format; 135 //设置Z缓冲
136 drawArgs.Device.SetRenderState(RenderState.ZEnable, 1); 137 //设置纹理状态，此处使用纹理 138 //drawArgs.Device.SetTexture(0, texture);//设置贴图
139 drawArgs.Device.SetStreamSource(0, vertBuffer, 0, PositionColored.SizeBytes); 140 drawArgs.Device.Indices = indBuffer; 141 drawArgs.Device.VertexFormat = PositionColored.Format; 142 drawArgs.Device.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, modelVertCount, 0, modelFaceCount); 143 } 144 catch (Exception e) 145 { 146 Utility.Log.Write(e); 147 } 148 finally
149 { 150 drawArgs.Device.SetTransform(TransformState.World, world); 151 drawArgs.Device.VertexFormat = format; 152 drawArgs.Device.SetRenderState(RenderState.ZEnable, zEnable); 153 drawArgs.Device.SetTextureStageState(0, TextureStage.ColorOperation, colorOper); 154 } 155 if (disposing) 156 { 157 Dispose(); 158 disposing = false; 159 } 160 } 161 public bool disposing = false; 162 /// <summary>
163 /// 更新对象 164 /// </summary>
165 /// <param name="drawArgs">渲染参数</param>
166 public override void Update(DrawArgs drawArgs) 167 { 168 if (!this.isInitialized) 169 { 170 this.Initialize(drawArgs); 171 } 172 } 173
174 /// <summary>
175 /// 执行选择操作 176 /// </summary>
177 /// <param name="X">点选X坐标</param>
178 /// <param name="Y">点选Y坐标</param>
179 /// <param name="drawArgs">渲染参数</param>
180 /// <returns>选择返回True,否则返回False</returns>
181 public bool PerformSelectionAction(int X, int Y, DrawArgs drawArgs) 182 { 183 return false; 184 } 185
186
187 /// <summary>
188 /// 释放对象 189 /// </summary>
190 public override void Dispose() 191 { 192 this.isInitialized = false; 193 //base.Dispose();
194 } 195 #endregion
196
197 private void LoadTexturesAndMaterials(DrawArgs drawArgs)//导入贴图和材质
198 { 199
200 } 201
202
203 public override bool PerformSelectionAction(DrawArgs drawArgs) 204 { 205 bool flag = PerformSelectionAction(DrawArgs.LastMousePosition.X, DrawArgs.LastMousePosition.Y, drawArgs); 206 return flag; 207 } 208
209 } 210 }
顶点缓冲创建方法：
1 public static VertexBuffer CreateVertexBuffer(Device device, PositionColored[] vertices) 2 { 3 VertexBuffer vertexBuffer = new VertexBuffer(device, vertices.Length * CustomVertex.PositionColored.SizeBytes, Usage.Dynamic | Usage.WriteOnly, CustomVertex.PositionColored.Format, Pool.Default); 4 DataStream vs = vertexBuffer.Lock(0, vertices.Length * CustomVertex.PositionColored.SizeBytes, LockFlags.None); 5 vs.WriteRange(vertices); 6 vertexBuffer.Unlock(); 7 vs.Dispose(); 8 return vertexBuffer; 9 }
索引的：
1 public static IndexBuffer CreateIndexBuffer(Device device, short[] indicesData) 2 { 3 IndexBuffer indexBuffer = new IndexBuffer(device, 16 * indicesData.Length, Usage.WriteOnly, Pool.Default, true); 4 DataStream ds = indexBuffer.Lock(0, 16 * indicesData.Length, LockFlags.None); 5 ds.WriteRange(indicesData); 6 indexBuffer.Unlock(); 7 ds.Dispose(); 8 return indexBuffer; 9 }
效果图：
![[Slimdx]顶点和索引缓冲，绘制了2个分离的三角形](http://img.e-com-net.com/image/product/ec43d76ebb8d4a6ea13610c9c0d1d221.png)